Poisonless pufferfish, fed only mackerel and other nonpoisonous food, swim in a circulatory tank filled with filtered sea water at Fisheries Ecology Research Center run by seafood restaurant Manbou Co. in the southern Japanese fishing town of Yobuko in this photo taken in January 2003. Blowfish, known in Japanese as 'fugu,' has long been a delicacy only for the adventurous: every year in Japan, a few people are poisoned to death eating it. Now scientists have put a school of pufferfish on a special diet and come up with a version without the lethal consequences. (AP Photo/Manbou Co.)
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